Tool-holder for tool-grinding machines.



T. LUMSDEN. l TOOL HOLDER FOR TOOL GRINDING MACHINES.

APPLICATION FILED 00T. 1B, 1912.

Patent-,ed s911119, 1913.

3 SHEETS-SHEET 1.

T. LUMSDEN.

TooL HOLDER FOR Toor, GRINDING MACHINES. APPLICATION FILED 0OTL18', 1912.

1,072,629. Patented sep1;.9,1913.

3 SHEETS-SHEET 2..

T. LUMSDBN.

TOOL HOLDER POR. TOOL GRINDING MACHINES. y I APPLICATION FILED 0OT.18, 1912. 1,072,629. Patented sept.9,1913.

3 SHEETS-SHEET 3.

JMW

COLUMBIA PLANGRAPx-l Co.. WASHINGTON, D. c.

ATES *ATF-INT 'i THOMAS LUMSDEN, OF GATESHEAD, ENGLAiND.

Y TOOL-HOLDER FOR TOOL-GRINDING MACHINES.

To all whom t may concern:

Be it known thatI, THOMAS LUMsDiaN, a subject of the King of Great Britain and Ireland, residing at Gateshead, in the county ot Durham, England, have invented new and useful Improvements in Tool-Holders for Tool-Grinding Machines, of which the following is a specification.

This invention relates to tool holders for grinding machines especially machines for grinding the tools ot lathes, planing, slotting, shaping and like machines, andthe invention has for its object to provide improved means or facilitating the accurate grinding of the rounded nose of a tool which projects to one side or is ott-set from the Center line of the shank of the tool and also to provide an improved arrangement of chuck for clamping the tool in the holder.

According to one pait of the invention I so arrange the holder or so mount and clamp the tool therein that the tool, after being clamped, can be rectilinearly moved or adjusted transversely or at right angles to its longitudinal center line to carry the geometrical center of an ott-set nose into alinetion, instead of arranging the dogs of thechuck for clamping the tool equidistantly or at angles of 1200 to each other as is usual,

. I arrange two of the dogs at a considerably lesser angle to each other than tothe third des l In the accompanyingdrawings Figure 1 is a longitudinal section (onthe line X-X in Fig. 3) illustrating one embodiment of the invention. Fig. 2 is a sectional plan on the line Y-Y in Fig. 1;"Fig. 3 is an `elevation looking yon the right-hand side of Fig. 1; and Fig. a is an elevation, partly in section, looking on the left hand side of Fig. 1. Fig. 5 is a longitudinal section illustrait-ing another embodiment of the invention, and Fig. 6 is an elevation looking on the right-hand side of Fig. 5.

Referring to Figs. 1 to t, a is a block mounted in an annular carrier ontrame b and angularly adjustable therein. "Ihe carrier or traine h is pivoted at c to an eX- tension ci on a turn-table e carried by a compound slide part `of which is shown at 7. The tool to be ground,y which is indicated in dot-and-dashlines in Figs. 2 andV 3, is clamped 'in the block a by a chuck comprising three wedge-shaped or tapered dogs g,

' specification of Letters Patent. y

'f Patented sept. 9, isis.

Application filed October 18, 1912. Serial No. 726,497.

g1 and g2 which are mounted and slide in dovetailed grooves in a conical box 7L attachred to the block a. The dogs g, g1 and g2 are connected by toggles, pivoted links or `the like j to a sleeve 7c splined in the block a by a key m on the block engaging a groove or key-way 'a in the sleeve. llVith a screw j l thread on the sleeve la co-acts a nut 0 mounted on the block a and retained thereon by a locking ring p made in halves'and fitting into a groove in the block. On rotating the nut 0 by handles g the sleeve is Atraveled axially and causes the dogs g, g1 and g2 through their engagement with the conical boX 71, to recede from or approach each other according to the direction of rotation of the nut.

Instead of arranging the dogs g, g1 and g2 equidistantly or at angles of 120 to each otheras is usual in such chucks, and in order that the chuck may have a wider range than usual for `clamping tools ot'various sii/jes and sections, I arrange two of the dogs vat a considerably lesser angle to each other than to the third dog. Preferably the dogs g1 and g2 are arranged at an angle of 900 to eachother so that each is at an angle of 135 to the dog g.

In order, when grinding a tool having an ott-set rounded nose, that the geometrical center of the nose maybe alined with the center 7" ofthe turn-table e about which the tool-holder and the tool are moved to grind rounded surfaces, one lug s in which the pivot c is mounted is provided on the extension d of the turn-table and the other lug z? isprovided on a slide u which is adjustable on a guide o on the extension d by means of an adjusting screw fw. The slide u also carries a bracket af to which the carrier or frame Z) is clamped by a clamping nut y in the desired angular position on Vits pivot c asY usual. By operating theadjusting screw io the carrier or trame b and itsl attached parts can be moved as shown in Figs. 2 and 3, transversely or at right angles to its axis and the longitudinal center line of the tool to bring the geometrical center of the nose of the tool into co-,incidence or alinement with thecenter 9'V of the turii-table c so that moving or oscillating the turn-table the tool is moved or oscillated about the geometrical center ot' its nose and the latter can be accurately ground. j

It is obvious that, instead of adjusting or moving thevannular carrier or trame b transversely or atright angles to its axis,

I may arrange the tool to be adjustable in or on the block a transversely or at right angles to the axis thereof. Such an arrangement is shown in Figs.` 5 and 6 wherein a is a tool-support mounted in a transverse slot 2 in the block a and adapted to be adj usted or moved therein by a Worm 3 mounted on the rear face of the block a and coiacting With a corresponding rack 4 on the support e. 'Ilie Worm 3 is operated by a handle 5, and the support z is clamped in the required position by a clamping screw 6 passing through a slot 7 in the support. lThe dogs g, g1 and g2 for clamping the tool in the support a are operated by yan annular disk 8 mounted on the support and provided With a spiral or scroll-like screw `thread 9 which co-acts with corresponding part Vthreads on the dogs. The disk S is operated by a bevel pinion 10 provided with a handle 1l and engaging teeth 12 formed on Athe disk. Y

13 are t-he usual spring plungers which engage adjustable stops la on the block aV tor holding the latter at any desired angular adjustment in the annular carrier or frame b, and the usual stops for holding the turntable e at any desired angular position Will of course be provided.

It Will now be seen that, once the tool has been clamped in the holder, it need not be re-adjusted therein or removed until the YWhole of the several faces or surfaces have been ground as required as every face or surface can be brought into posit-ion for grinding` by the various adjustments ot' the holder.

`What I claim and desire tosecure by Letters Patent is l. In tool holders for tool grinding machines the combination of a turn-table, an annular carrier or frame pivoted on said turn-table and angularly adjustable about its pivot, a block mounted in said annular' carrier or frame and angularly adjustable therein, means for clamping the tool to be ground in said block, and means for rectilinearly adjusting said tool relativelyv to the center of said turn-table and transversely or at right angles to the length of the tool after it has been clamped.

2. In tool holders tor tool grinding machines the combination of a turn-table, an annular carrier or frame pivoted on said turntable in the horizontal plane and angularly adjustable in the vertical plane, a

block mounted in said annularcarrier or frame and angularly adjustable therein, means for clamping the tool to be ground in said block, and meansV for rectilinearly adjusting said annular carrier or frame relatively to the center ot1 said turn-table and parallel to the axis of its pivot. t

Copies of this patent may be obtained for Vnular carrier or frame Vmounted on said pivot, an adjusting screw for adjusting said slide parallel to the axis of said pivot, a

block mounted in said annular carrier orV frame and angularly adjustable therein, and means for clamping the tool to be ground in said block.

4. In tool holders for tool grinding niachines the combination of a turn-table, an annular carrier or frame pivoted on said turn-table and angularly adjustable about its pivot, a block mounted in said annular carrier or frame and angularly adjustable therein, means tor rectilinearly adjusting said annular carrier or frame relatively to the center of said turn-table and transversely or at right angles to its axis, and a chuck for clamping the tool to be ground in said block, said chuck comprising three dogs two of Which are arranged at a considerably lesser angle to each other than to the third dog.

5. In tool holders for tool grinding machines the combination of a turn-table, an annular carrier or. frame pivoted on said turn-table and angularly adjustable about its pivot, a block mounted in said annular carrier or frame and angularly adjustable therein, a tool-support on said block, means -for clamping the tool to be ground in said support, and means for rectilinearly adjusting said tool support relatively to the center ot saidl turn-table and transversely or at right angles to said block. Y,

`6. In tool holders for tool grinding machines the combination of a turn-table, an annular carrier pivoted on said turn-table and angularly adjustable about its pivot, a block mounted in said annular carrier or frame and angularly adjustable therein, a transverse slot in said block, a tool-support mounted in said slot and rectilineai'ly adjustable therein relatively to the center of said turn-table and transversely or at right angles to the aXis of said block, and a chuck for clamping the tool to be ground in said tool-support, said chuck comprising three dogs tivo of which are arranged at a considerablylesser angle to each other than to the third.

In testimony whereof 'I have signed my name to this specification in the presence of two subscribing Witnesses.

Y THOMAS LUMSDEN.

Witnesses: EDMUND WARD PATTISON, HERBERT HOWARD.

ive cents each, by addressing the Commissioner of Patents, Washington, D. C. f t 

